1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #ifndef _STDLIB_H
30 #error "Never include this file directly; instead, include <stdlib.h>"
31 #endif
32
33 #if defined(__BIONIC_FORTIFY)
34 #define __realpath_buf_too_small_str \
35 "'realpath' output parameter must be NULL or a pointer to a buffer with >= PATH_MAX bytes"
36
37 /* PATH_MAX is unavailable without polluting the namespace, but it's always 4096 on Linux */
38 #define __PATH_MAX 4096
39
40 #if defined(__clang__)
41 char* realpath(const char* path, char* resolved)
42 __clang_error_if(__bos(resolved) != __BIONIC_FORTIFY_UNKNOWN_SIZE &&
43 __bos(resolved) < __PATH_MAX, __realpath_buf_too_small_str)
44 __clang_error_if(!path, "'realpath': NULL path is never correct; flipped arguments?");
45 /* No need for a definition; the only issues we can catch are at compile-time. */
46
47 #else /* defined(__clang__) */
48
49 char* __realpath_real(const char*, char*) __RENAME(realpath);
50 __errordecl(__realpath_size_error, __realpath_buf_too_small_str);
51
52 __BIONIC_FORTIFY_INLINE
realpath(const char * path,char * resolved)53 char* realpath(const char* path, char* resolved) {
54 size_t bos = __bos(resolved);
55
56 if (bos != __BIONIC_FORTIFY_UNKNOWN_SIZE && bos < __PATH_MAX) {
57 __realpath_size_error();
58 }
59
60 return __realpath_real(path, resolved);
61 }
62
63 #endif /* defined(__clang__) */
64
65 #undef __PATH_MAX
66 #undef __realpath_buf_too_small_str
67 #endif /* defined(__BIONIC_FORTIFY) */
68